英语词汇“constant”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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Think of something or someone that does not change as constant. A classmate's constant drumming on the table with his fingers could be a constant source of annoyance.

Constant derives from Latin verb meaning "to stand with," so something constant is continually standing with you and not wavering. You may be thankful for the constant companionship of your dog but not necessarily for your teacher's constant homework assignments. In math and science, a constant is a number that is fixed and known, unlike a variable which changes with the context. That idea crosses over to real life. If a friend is a constant in your life, that means they have always been with you and there for you.

WORD FAMILY

constant: constancy, constantly, constants, inconstant+/constancy: constancies/inconstancy: inconstancies/inconstant: inconstancy, inconstanter, inconstantly

USAGE EXAMPLES

“Being in constant pain is no way to run a re-election campaign,” he said.

Washington Times(Jan 02, 2017)

It seemed his first duty was keeping a constant smile, even as he battled through what is now his third bout with cancer, Long said.

Washington Times(Jan 02, 2017)

Healthy living is a lifestyle change that requires constant effort.

New York Times(May 02, 2016)

1adj uninterrupted in time and indefinitely long continuing

in constant pain

Syn

ceaseless, incessant, never-ending, perpetual, unceasing, unremitting
continuous, uninterrupted

continuing in time or space without interruption

2adj unvarying in nature

maintained a constant temperature

Syn

changeless, invariant, unvarying
invariable

not liable to or capable of change

3adj steadfast in purpose or devotion or affection

a man constant in adherence to his ideals
a constant lover
constant as the northern star

Syn|Ant

unchangeable

not changeable or subject to change

staunch, steadfast, unswerving

firm and dependable especially in loyalty

unfailing, unflagging

unceasing

faithful

steadfast in affection or allegiance

stable

resistant to change of position or condition

invariable

not liable to or capable of change

inconstant

likely to change frequently often without apparent or cogent reason; variable

changeable, changeful

such that alteration is possible; having a marked tendency to change

false, untrue

(used especially of persons) not dependable in devotion or affection; unfaithful

fickle, volatile

marked by erratic changeableness in affections or attachments

unfaithful

not true to duty or obligation or promises

unstable

lacking stability or fixity or firmness

variable

liable to or capable of change

volatile

evaporating readily at normal temperatures and pressures

4n a quantity that does not vary

Syn|Hypo|Hyper

constant quantity, invariable

parameter, parametric quantity

a constant in the equation of a curve that can be varied to yield a family of similar curves

degree of freedom

one of the minimum number of parameters needed to describe the state of a physical system

quantity

the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable

5n a number representing a quantity assumed to have a fixed value in a specified mathematical context

the velocity of light is a constant

Hypo|Hyper

Avogadro number, Avogadro's number

the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)

Boltzmann's constant

constant used in the calculation of the ideal gas constant

coefficient

a constant number that serves as a measure of some property or characteristic

cosmological constant

an arbitrary constant in the equations of general relativity theory

equilibrium constant

(chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)

R, gas constant, universal gas constant

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

G, constant of gravitation, gravitational constant, universal gravitational constant

(physics) the universal constant relating force to mass and distance in Newton's law of gravitation

Hubble constant, Hubble parameter, Hubble's constant, Hubble's parameter

(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today

ionic charge

the charge on an ion is equal to a constant charge e multiplied by an integer from 1 to 15

constant of proportionality, factor of proportionality

the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality

c, light speed, speed of light

the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second

absorptance, absorption coefficient, coefficient of absorption

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber

coefficient of drag, drag coefficient

the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body

coefficient of friction

the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface

coefficient of mutual induction, mutual inductance

a measure of the induction between two circuits; the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit; usually measured in henries

coefficient of self induction, self-inductance

the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries

modulus

(physics) a coefficient that expresses how much of a specified property is possessed by a specified substance

coefficient of expansion, expansivity

the fractional change in length or area or volume per unit change in temperature at a given constant pressure

coefficient of reflection, reflectance, reflection factor, reflectivity

the fraction of radiant energy that is reflected from a surface

transmission, transmittance

the fraction of radiant energy that passes through a substance

absolute viscosity, coefficient of viscosity, dynamic viscosity

a measure of the resistance to flow of a fluid under an applied force

weight, weighting

(statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance

dissociation constant

the equilibrium constant for a reversible dissociation

Planck's constant, h

the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second

number

a concept of quantity involving zero and units

单词	constant
释义	constant (once / 63 pages) adjn Think of something or someone that does not change as constant. A classmate's constant drumming on the table with his fingers could be a constant source of annoyance. Constant derives from Latin verb meaning "to stand with," so something constant is continually standing with you and not wavering. You may be thankful for the constant companionship of your dog but not necessarily for your teacher's constant homework assignments. In math and science, a constant is a number that is fixed and known, unlike a variable which changes with the context. That idea crosses over to real life. If a friend is a constant in your life, that means they have always been with you and there for you. WORD FAMILY constant: constancy, constantly, constants, inconstant+/constancy: constancies/inconstancy: inconstancies/inconstant: inconstancy, inconstanter, inconstantly USAGE EXAMPLES “Being in constant pain is no way to run a re-election campaign,” he said. Washington Times(Jan 02, 2017) It seemed his first duty was keeping a constant smile, even as he battled through what is now his third bout with cancer, Long said. Washington Times(Jan 02, 2017) Healthy living is a lifestyle change that requires constant effort. New York Times(May 02, 2016) 1adj uninterrupted in time and indefinitely long continuing in constant pain Syn ceaseless, incessant, never-ending, perpetual, unceasing, unremitting continuous, uninterrupted continuing in time or space without interruption 2adj unvarying in nature maintained a constant temperature Syn changeless, invariant, unvarying invariable not liable to or capable of change 3adj steadfast in purpose or devotion or affection a man constant in adherence to his ideals a constant lover constant as the northern star Syn\|Ant unchangeable not changeable or subject to change staunch, steadfast, unswerving firm and dependable especially in loyalty unfailing, unflagging unceasing faithful steadfast in affection or allegiance stable resistant to change of position or condition invariable not liable to or capable of change inconstant likely to change frequently often without apparent or cogent reason; variable changeable, changeful such that alteration is possible; having a marked tendency to change false, untrue (used especially of persons) not dependable in devotion or affection; unfaithful fickle, volatile marked by erratic changeableness in affections or attachments unfaithful not true to duty or obligation or promises unstable lacking stability or fixity or firmness variable liable to or capable of change volatile evaporating readily at normal temperatures and pressures 4n a quantity that does not vary Syn\|Hypo\|Hyper constant quantity, invariable parameter, parametric quantity a constant in the equation of a curve that can be varied to yield a family of similar curves degree of freedom one of the minimum number of parameters needed to describe the state of a physical system quantity the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable 5n a number representing a quantity assumed to have a fixed value in a specified mathematical context the velocity of light is a constant Hypo\|Hyper Avogadro number, Avogadro's number the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000) Boltzmann's constant constant used in the calculation of the ideal gas constant coefficient a constant number that serves as a measure of some property or characteristic cosmological constant an arbitrary constant in the equations of general relativity theory equilibrium constant (chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction) R, gas constant, universal gas constant (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole G, constant of gravitation, gravitational constant, universal gravitational constant (physics) the universal constant relating force to mass and distance in Newton's law of gravitation Hubble constant, Hubble parameter, Hubble's constant, Hubble's parameter (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today ionic charge the charge on an ion is equal to a constant charge e multiplied by an integer from 1 to 15 constant of proportionality, factor of proportionality the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality c, light speed, speed of light the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second absorptance, absorption coefficient, coefficient of absorption a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber coefficient of drag, drag coefficient the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body coefficient of friction the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface coefficient of mutual induction, mutual inductance a measure of the induction between two circuits; the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit; usually measured in henries coefficient of self induction, self-inductance the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries modulus (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance coefficient of expansion, expansivity the fractional change in length or area or volume per unit change in temperature at a given constant pressure coefficient of reflection, reflectance, reflection factor, reflectivity the fraction of radiant energy that is reflected from a surface transmission, transmittance the fraction of radiant energy that passes through a substance absolute viscosity, coefficient of viscosity, dynamic viscosity a measure of the resistance to flow of a fluid under an applied force weight, weighting (statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance dissociation constant the equilibrium constant for a reversible dissociation Planck's constant, h the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second number a concept of quantity involving zero and units
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